merge(3p/immer): Subtree merge at 'ad3e3556d' as 'third_party/immer' r/1299

Change-Id: I9636a41ad44b4218293833fd3e9456d9b07c731b

1 files changed, 54 insertions, 0 deletions

diff --git a/third_party/immer/extra/guile/scm/list.hpp b/third_party/immer/extra/guile/scm/list.hpp
new file mode 100644
index 000000000000..dc162c200244
--- /dev/null
+++ b/third_party/immer/extra/guile/scm/list.hpp
@@ -0,0 +1,54 @@
+//
+// immer: immutable data structures for C++
+// Copyright (C) 2016, 2017, 2018 Juan Pedro Bolivar Puente
+//
+// This software is distributed under the Boost Software License, Version 1.0.
+// See accompanying file LICENSE or copy at http://boost.org/LICENSE_1_0.txt
+//
+
+#pragma once
+
+#include <scm/val.hpp>
+#include <iostream>
+
+namespace scm {
+
+struct list : detail::wrapper
+{
+    using base_t = detail::wrapper;
+    using base_t::base_t;
+
+    using iterator = list;
+    using value_type = val;
+
+    list() : base_t{SCM_EOL} {};
+    list end() const { return {}; }
+    list begin() const { return *this; }
+
+    explicit operator bool() { return handle_ != SCM_EOL; }
+
+    val operator* () const { return val{scm_car(handle_)}; }
+
+    list& operator++ ()
+    {
+        handle_ = scm_cdr(handle_);
+        return *this;
+    }
+
+    list operator++ (int)
+    {
+        auto result = *this;
+        result.handle_ = scm_cdr(handle_);
+        return result;
+    }
+};
+
+struct args : list
+{
+    using list::list;
+};
+
+} // namespace scm
+
+SCM_DECLARE_WRAPPER_TYPE(scm::list);
+SCM_DECLARE_WRAPPER_TYPE(scm::args);